(Limp) Cross Progression

Using my suspension trainer, I have been trying to work up the strength to hold an Iron Cross.

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I cannot yet achieve that move. I have begun to lower myself, however, and can get to about 45 degrees of arm separation. It is quite stressful on the shoulders and joints. I can hold it at about 45 degrees for about 5-7 seconds and then pull myself up and down again. It looks something like this:

.. I am getting there, slowly, but surely, I am getting there...